A WLAN baseband chip and an FDMA PPDU generation method are disclosed. The WLAN baseband chip obtains a subcarrier coefficient corresponding to a subcarrier set, m LDR SYNC sequences, and n−m HDR SYNC sequences. The WLAN baseband chip performs duplicating processing on m data streams in n data streams, to obtain m data sequences on which the duplicating processing has been performed and n−m remaining data streams. The WLAN baseband chip obtains m pieces of to-be-modulated data based on the m LDR SYNC sequences and the m data sequences on which the duplicating processing has been performed, and obtains n−m pieces of to-be-modulated data based on the n−m HDR SYNC sequences and the n−m remaining data streams, to obtain n pieces of to-be-modulated data. The WLAN baseband chip performs postprocessing to obtain a frequency-domain symbol sequence, to obtain an FDMA PPDU.
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2. The WLAN baseband chip according to claim 1, wherein every two non-zero coefficients in the subcarrier coefficient sequence are spaced by at least one zero coefficient.
3. The WLAN baseband chip according to claim 2, wherein the subcarrier coefficient sequence comprises p subcarrier coefficients, p is an odd number, values of a 2jth subcarrier coefficient and a center subcarrier coefficient are zero, a value of a (2j+1)th subcarrier coefficient other than the center subcarrier coefficient is a non-zero value, j<p, and both j and p are positive integers.
4. The WLAN baseband chip according to claim 2, wherein the postprocessing further comprises intercepting a half of a time domain symbol to obtain a short time-domain symbol.
10. A wireless local area network (WLAN) device, wherein the WLAN device comprises the WLAN baseband chip according to claim 1.
11. The WLAN device according to claim 10, wherein every two non-zero coefficients in the subcarrier coefficient sequence are spaced by at least one zero coefficient.
12. The WLAN device according to claim 11, wherein the subcarrier coefficient sequence comprises p subcarrier coefficients, p is an odd number, values of a 2jth subcarrier coefficient and a center subcarrier coefficient are zero, a value of a (2j+1)th subcarrier coefficient other than the center subcarrier coefficient is a non-zero value, j<p, and both j and p are positive integers.
13. The WLAN device according to claim 11, wherein the postprocessing further comprises intercepting a half of a time domain symbol to obtain a short time-domain symbol.
18. The method according to claim 17, wherein every two non-zero coefficients in the subcarrier coefficient sequence are spaced by at least one zero coefficient.
19. The method according to claim 18, wherein the subcarrier coefficient sequence comprises p subcarrier coefficients, p is an odd number, values of a 2jth subcarrier coefficient and a center subcarrier coefficient are zero, a value of a (2j+1)th subcarrier coefficient other than the center subcarrier coefficient is a non-zero value, j<p, and both j and p are positive integers.
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January 5, 2021
January 17, 2023
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